a lightly covered and unnoticeable pit prepared as a trap for people or animals.

any trap or danger for the unwary

the pitfall of excessive pride.

noun

advantage , blessing , good luck

noun

booby trap * , catch * , danger , deadfall * , difficulty , downfall , drawback , entanglement , hook * , mesh * , mousetrap , peril , pit * , quicksand * , risk , setup , snag * , snare , swindle * , toil , webnotes:a pitfall is an unforeseen or unexpected difficulty or disaster - or a trap in the form of a concealed hole; a pratfall is an embarrassing or humiliating mistake , blunder , or mishap - or a fall on the buttocks , booby trap , trap , artifice , hazard , inveiglement , maelstrom , pit , problem , snag , springe , subterfuge , temptation , traps